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Abstract

Disclosed is a feedback-controlled ac-coupled active pull down scheme for ECL/DCS circuits which minimizes the loading to the logic stage and provides a sharp, self-terminating dynamic pull-down current.

Country

United States

Language

English (United States)

This text was extracted from an ASCII text file.

This is the abbreviated version, containing approximately
66% of the total text.

Feedback Controlled AC-coupled Active Pull Down ECL/DCS
Circuits

Disclosed is
a feedback-controlled ac-coupled active pull
down scheme for ECL/DCS circuits which minimizes the loading to the
logic stage and provides a sharp, self-terminating dynamic pull-down
current.

Recently,
various active pull down schemes have been pursued to
reduce the power consumption and improve the pull-down delay of the
emitter-follower stage in high-speed ECL/DCS circuits. One example
is the ac-coupled active pull down ECL circuit shown in Fig. 1 (1)
where a capacitor is used to couple a transient signal from the
in-phase collector-node of the current switch to the base of the
pull-down transistor. In this
configuration, however, the coupling
capacitor C sub X represents a load to the (critical) collector node
and hence large dynamic pull-down current (large coupling capacitor)
and fast switching of the logic stage can not be achieved
simultaneously. Furthermore, this scheme
requires two input signals
for the emitter-follower stage (one from the out of phase collector
node to the base of the emitter-follower transistor and the other
from the in-phase collector node to the base of the pull-down
transistor through CX), thus complicating the wiring, especially for
DCS implementation where both phases are needed.

The disclosed
scheme (Fig. 2 for ECL implementation) utilizes a
feedback capacitor to couple the transient signal from the collector
node of the emit...